ATI Radeon BIOS Editor 1.19 released, adds voltage control for HD4870X2
 

TechPowerUp introduces Radeon BIOS Editor (RBE) v1.19. The software comes as a respite for users of ATI Radeon graphics cards seeking seamless GPU BIOS manipulation. The newest version of the software brings about the following changes:

* Fixed a startup bug causing the main window not to show up.
* Added experimental voltage register access. RBE automatically figures out if the card's equipped with a VT11xx. Just use register 15 for underclocking/undervolting and register 18 for overclocking. Register tweaking will override the voltage table. Still, you should adjust your powerplay settings according to the new register values.

The new features facilitate manipulating the voltage registers of Radeon HD 4870 and HD 4870 X2, making a real software voltmod possible.

Link to a usage tutorial in the comments of this newspost!
http://www.techpowerup.com/downloads...tor_v1.19.html

the tutorial: http://www.techpowerup.com/articles/...ng/vidcard/154